While folding laundry I noticed that the finished edge of a sleeve was coming undone (if there isn’t actually a cuff, is it still called a cuff? Or is it a sleeve hem?).
Not having a machine that sews a “stretchy stitch”, I carefully sewed the hemmed cuff edge while slightly stretching the fabric. The stitches look a little loose, but they should be fine for now.
I may have to finally break down and learn how to thread the over-lock machine.